Willie Pep - brilliantly elusive boxer with 200+ contests. Boxer, not Striker.
Archie Moore - "the Ole Moongoose" has the greatest number of KOs. He overtook Young Stribling (who used to fight his Chauffeur, allegedly, as he toured the USA. Archie was World Light-Heavyweight Champion for 10 years until he gave it up. Last fight was against the young "Cassius Clay".